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Steel MakingLiberty Motor Connecting RodsThe requirements for materials for the Liberty motor connecti... The Effect The heating at 1,600 deg.F. gives the first heat treatment w... The Thermo-couple With the application of the thermo-couple, the measurement of... Alloying Elements Commercial steels of even the simplest types are therefore p... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... The Packing Department In Fig. 56 is shown the packing pots where the work is packe... Case-hardening Treatments For Various Steels Plain water, salt water and linseed oil are the three most co... Chromium Chromium when alloyed with steel, has the characteristic func... William Kelly's Air-boiling Process An account of Bessemer's address to the British Association w... Gears The material used for all gears on the Liberty engine was sel... Sulphur Sulphur is another impurity and high sulphur is even a greate... Knowing What Takes Place How are we to know if we have given a piece of steel the ver... The Penetration Of Carbon Carburized mild steel is used to a great extent in the manufa... The Forging Of Steel So much depends upon the forging of steel that this operation... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Placing The Thermo-couples The following illustrations from the Taylor Instrument Compan... Carburizing Low-carbon Sleeves Low-carbon sleeves are carburized and pushed on malleable-ir... Typical Oil-fired Furnaces Several types of standard oil-fired furnaces are shown herew... |
An Automatic Temperature Control PyrometerCategory: PYROMETRY AND PYROMETERS Automatic temperature control instruments are similar to the Brown indicating high resistance pyrometer with the exception that the pointer is depressed at intervals of every 10 sec. upon contact-making devices. No current passes through the pointer which simply depresses the upper contact device tipped with platinum, which in turn comes in contact with the lower contact device, platinum-tipped, and the circuit is completed through these two contacts. The current is very small, about 1/10 amp., as it is only necessary to operate the relay which in turn operates the switch or valve. A small motor is used to depress the pointer at regular intervals. The contact-making device is adjustable throughout the scale range of the instrument, and an index pointer indicates the point on the instrument at which the temperature is being controlled. The space between the two contacts on the high and low side, separated by insulating material, is equivalent to 1 per cent of the scale range. A control of temperature is therefore possible within 1 per cent of the total scale range. Figure 131 shows this attached to a small furnace. Next: Pyrometers For Molten Metal Previous: Brown Automatic Signaling Pyrometer
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